draw_something.rb

unless ARGV.size == 2                                              
  puts "USAGE: ruby guess.rb ACKRCKOOLCWZ 5"                       
  exit 1                                                           
end                                                                
                                                                   
letters = ARGV[0].downcase.split(//).sort
length = ARGV[1].to_i                                              

words = []                                                         
File.open('/usr/share/dict/words') do |file|
  file.each do |line|
    word = line.strip.downcase
    words << word if word.length == length
  end
end                                                                

def valid?(word, letters)
  word_index = letters_index = 0
  while word_index < word.length && letters_index < letters.length
    if word[word_index] == letters[letters_index] 
      word_index = word_index + 1
    end
    letters_index = letters_index + 1
  end
  return word_index == word.length
end

guesses = []
words.each do |word|
  guesses << word if valid?(word.split(//).sort, letters)
end

guesses.each do |guess|
  puts guess 
end